In addition to the mechanical fault issues mentioned, consider suction pressure. Blower load and motor current are are affected by both suction and discharge pressures. Check suction for blockage, such as air/intake filter or other upstream issues.
Walt
The word "installation" in the OP Title could have two meanings; final location or where the rotating equipment is moved into final location in plat/vessel. Ship machinery are typically installed for new construction or major repairs or at a dock with direct shore access. No experience with...
Suggest at least tack-welding the thick plate to bed/foundation. Leave the thin shims loose or install tapered pins (with top nuts) from machine feet into thick plate to reduce shifting shaft alignment.
Walt
Note that your sketcs shows the Vertical (d) dimension difference to be 50 mm. That is quite a difference for motor of same HP and Frame Size!
Thick plates, if machined flat, should not affect vibrations if soft-foot and shaft alignmnet are good. Allow 1 to 2 mm of height for thin SS shims to...
If bearing vibrations are normal in the horizontal and axial/thrust direction and only high in vertical direction,then possible causes are: excessive bearing clearance or resonant structure. The resonant structure hypothesis can be verified by variable speed (run up) test and/or impact-response...
Resonant or natural frequency testing may be used.
https://www.modalshop.com/ndt
The challenge would be small part size to measure high natural frequencies. I suggest prototye testing of good and known-bad parts. If that works, then automatic or semi-automatic test stations can be configured...
